Supernova distance and primary cosmic microwave background (CMB) anisotropy measurements provide us with powerful probes of the dark energy evolution in a flat universe, but they degrade substantially once curvature is marginalized. We show that lensed CMB polarization power spectrum measurements, accessible to next generation ground-based surveys such as SPTpol or QUIET, can remove the curvature degeneracy at a level sufficient for the SNAP and Planck surveys and allow a measurement of σ(w_p) = 0.03, σ(w_a) = 0.3 jointly with σ(Ω_k) = 0.0035. This expectation assumes that the sum of neutrino masses is independently known to better than 0.1 eV. This assumption is valid if the lightest neutrino has negligible mass in a normal neutrino mass hierarchy and is potentially testable with upcoming direct laboratory measurements.
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